body{
  background-color:ghostwhite;
  padding: 0;
  margin: 0;
}
.header{
  width: 100%;
  height:80px;
  border: 1px solid red;
  font-weight:bolder;
  background-color: white;
  line-height: 80px;
  padding-left: 40px;
}
.container{
  width: 95%;
  height:100%;
  border: 1px solid blue;
  margin: 20px 40px;
  display: flex;
}
.left-nav{
  width: 164px;
  height:550px;
  border: 1px solid red;
  background-color: white;
  margin-right: 30px;
}
.left-nav ul{
  list-style: none;
  width: 164px;
}
.left-nav ul li{
  text-align: center;
  line-height: 40px;
  list-style: none;
  float: left;
  font-weight:200;
  display: block;
}
.left-nav ul li:hover{
  background-color: aliceblue; 
}
.right-context{
  width: 100%;
  height:550px;
  border: 1px solid green;
  background-color: white;
}

